东营凹陷页岩油储层层间干扰及裂缝扩展规律研究

孟勇 贾庆升 张潦源 郑彬涛 邓旭

孟勇, 贾庆升, 张潦源, 郑彬涛, 邓旭. 东营凹陷页岩油储层层间干扰及裂缝扩展规律研究[J]. 石油钻探技术, 2021, 49(4): 130-138. doi: 10.11911/syztjs.2021094
引用本文: 孟勇, 贾庆升, 张潦源, 郑彬涛, 邓旭. 东营凹陷页岩油储层层间干扰及裂缝扩展规律研究[J]. 石油钻探技术, 2021, 49(4): 130-138. doi: 10.11911/syztjs.2021094
MENG Yong, JIA Qingsheng, ZHANG Liaoyuan, ZHENG Bintao, DENG Xu. Research on Interlayer Interference and the Fracture Propagation Law of Shale Oil Reservoirs in the Dongying Sag[J]. Petroleum Drilling Techniques, 2021, 49(4): 130-138. doi: 10.11911/syztjs.2021094
Citation: MENG Yong, JIA Qingsheng, ZHANG Liaoyuan, ZHENG Bintao, DENG Xu. Research on Interlayer Interference and the Fracture Propagation Law of Shale Oil Reservoirs in the Dongying Sag[J]. Petroleum Drilling Techniques, 2021, 49(4): 130-138. doi: 10.11911/syztjs.2021094

东营凹陷页岩油储层层间干扰及裂缝扩展规律研究

doi: 10.11911/syztjs.2021094
基金项目: 中国石化科技攻关项目“陆相页岩油强化体积改造缝网压裂技术研究”(编号:P20069-6)部分研究内容
详细信息
    作者简介:

    孟勇(1972—),男,山东章丘人,1994毕业于石油大学(华东)采油工程专业,2006年获中国石油大学(北京)石油与天然气开发工程专业硕士学位,高级工程师,主要从事油气田开发工作。E-mail:mengyong682.slyt@sinopec.com

  • 中图分类号: TE357.1+1

Research on Interlayer Interference and the Fracture Propagation Law of Shale Oil Reservoirs in the Dongying Sag

  • 摘要: 东营凹陷页岩油储量丰富,但储层物性差,纵向含油层系多而薄,多为灰泥岩互层。为了准确描述东营凹陷页岩油储层层间应力干扰机理及水力压裂裂缝的扩展规律,利用非线性有限元法建立了基于渗流–应力–损伤耦合的多薄互层分层压裂模型,模拟分析了不同排量、压裂液黏度及不同上、下隔层厚度下的裂缝扩展形态、规律和诱导应力场,研究了裂缝扩展形态与诱导应力场的关系,并对压裂施工参数进行了优化。模拟结果表明:随着水力裂缝扩展,应力干扰区域越来越大;当排量为9~12 m3/min、黏度为20 mPa∙s时,裂缝尖端诱导应力大,易连通天然裂缝,压裂改造效果明显;上部隔层厚度大于2.50 m、下部隔层厚度大于4.50 m时,极少出现穿层现象。研究结果可为东营凹陷页岩油储层后续的水力压裂施工提供理论支撑。
  • 图  1  裂缝扩展过程中的流体流动示意

    Figure  1.  Fluid flow during fracture propagation

    图  2  Cohesive黏弹性孔压单元的损伤判断依据

    Figure  2.  Failure criterion for the Cohesive viscoelastic pore-pressure elements

    图  3  灰泥互层渗流–应力–损伤耦合分层压裂几何模型和离散模型

    Figure  3.  Geometric model and discrete model of separate-layer fracturing based on seepage-stress-damage coupling for interlayers of limestone and mudstone

    图  4  数值模拟与现场实测的破裂压力

    Figure  4.  Simulated fracturing pressure and field measured fracturing pressure

    图  5  不同压裂液排量下的裂缝形态

    Figure  5.  Fracture morphology under different flow rates of fracturing fluid

    图  6  不同压裂液排量下裂缝宽度和裂缝高度的变化

    Figure  6.  Variation of fracture width and height under different flow rates of fracturing fluid

    图  7  不同压裂液排量下的最小水平主应力

    Figure  7.  Minimum horizontal principal stress under different flow rates of fracturing fluid

    图  8  不同诱导应力的路径

    Figure  8.  Paths of different induced stresses

    图  9  不同压裂液排量下储/隔层中不同路径最小诱导应力沿x轴的变化情况

    Figure  9.  Variations in minimum induced stress along the x axis in different paths of reserve layers/isolation layers under different flow rates of fracturing fluid

    图  10  不同压裂液黏度下的裂缝形态

    Figure  10.  Fracture morphology under different viscosities of fracturing fluid

    图  11  不同压裂液黏度下的最小水平主应力

    Figure  11.  Minimum horizontal principal stress under different viscosities of fracturing fluid

    图  12  不同压裂液黏度下储层、隔层中不同路径最小诱导应力沿x轴的变化情况

    Figure  12.  Variations in minimum induced stress along the x axis in different paths of reserve layers/isolation layers under different viscosities of fracturing fluid

    图  13  不同上隔层厚度对应的最小水平主应力

    Figure  13.  Minimum horizontal principal stress with different thicknesses of the upper isolation layer

    图  14  不同下隔层厚度对应的最小水平主应力

    Figure  14.  Minimum horizontal principal stress with different thicknesses of the lower isolation layer

    图  15  隔层2和隔层3中不同厚度下x轴方向最小水平诱导应力的变化情况

    Figure  15.  Variations of minimum horizontal induced stress along the x axis with different thicknesses in the 2nd and 3rd isolation layers

    表  1  各层位的地层物性力学参数

    Table  1.   Physical and mechanical parameters of formations in different layers

    层位岩性弹性模量/GPa泊松比渗透率/mD孔隙度,%孔隙压力/MPa垂向应力/MPa最大水平主
    应力/MPa
    最小水平主
    应力/MPa
    隔层4泥岩240.280.023.238.2180.5378.5273.06
    储层3灰岩250.272.676.538.2180.7371.6167.25
    隔层3泥岩240.280.081.838.2180.9377.3372.98
    储层2灰岩250.271.536.838.2181.4370.4166.39
    隔层2泥岩240.280.013.138.2182.1676.7472.38
    储层1灰岩250.271.218.138.2184.8371.6167.75
    隔层1泥岩240.280.151.738.2184.9278.7473.48
    下载: 导出CSV

    表  2  水力裂缝Cohesive单元的基本参数

    Table  2.   Basic parameters of Cohesive elements of hydraulic fractures

    层位$ {t}_{\rm{n}}^{0} $/MPa$ {t}_{{\rm{s}}}^{0} $/MPa$ {G}_{{\rm{s}}}^{{\rm{c}}} $/(Pa·m)
    储层1126.7
    隔层2254.0
    下载: 导出CSV
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  • 收稿日期:  2021-03-29
  • 修回日期:  2021-06-29
  • 网络出版日期:  2021-08-02
  • 刊出日期:  2021-08-25

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